pri prediction enhances ew training by scott mcdonald & ken mcritchie ottawa, ontario, canada...
TRANSCRIPT
PRI Prediction
Enhances EW Training
By
Scott McDonald & Ken McRitchie
Ottawa, Ontario, Canada
Visit us at http://www.mc-cm.com
MC Countermeasure Inc.
19-Feb-2002 2Visit us at http://www.mc-cm.com
Overview
• Training vs Operational ECM
• Need for Prediction
• PRED Features
• PRED Performance
• Summary
19-Feb-2002 3Visit us at http://www.mc-cm.com
DRFM
• DRFM-based ECM originally developed for fully coherent applications
• Constant PRI makes up-range false targets easy
• Would like to do same with non-coherent/coherent on receive radars
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Training Application
• RAN/CF Programs
• DRFM-based ECM
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Operational vs Training• Mil-spec• Protect platform• Configuration control• Optimized by threat• Highly integrated,
compact size
• Benign environment• Non-interference• Highly programmable• Generate a variety of
ECM effects• Must replicate current
and future generation ECM
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Constant PRI
PRI 1 FT
PRI 2 FT
PRI 3 FT
PRI 4 FT
R1
R1
R1
False Target Delay R1
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PRI 1 FT
PRI 2 FT
PRI 3 FT
PRI 4 FT
False Target Delay R1
R2
R4
R3
Staggered PRI
19-Feb-2002 8Visit us at http://www.mc-cm.com
Radar Characteristics
• Surveillance, search, acquisition, TTR, TI
• Constant, dwell shift, modulated or staggered PRI patterns– Multi-element/position– Sliding– Sinusoidal
• 2 us < PRI < 14 ms
19-Feb-2002 9Visit us at http://www.mc-cm.com
Isolation• Many antennas compete for
little space in most EW Training installations– Leads to insufficient isolation
to transmit and receive simultaneously
– Precludes cover pulse– Situation corrected with PRI
prediction
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Features• Fast “learning”
– No UDF
• Prediction < 250 ns• > 128 positions• Adaptive
Acquisition• Fade mode• TG Enhancements
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Block DiagramClock
PRIMeasurement
DetectedVideo
Prediction Algorithm (CPU)
Predicted PRIOutput
JTAG AlgorithmUpload Port
Optional PWMeasurement
Optional RFTag
Up Range False Target Generator(for demonstration purposes)
In-Bound FalseTarget Strobes
20-BitPredictedPRI Value
19-Feb-2002 12Visit us at http://www.mc-cm.com
Integration with TG
Detected Video and RF TagFrom RF Sub-System
20-Bit Predicted PRI
DRFM
JTAG Port
TG
PRI Predictor
DIO
False TargetStrobes
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Optional FT Generator
Detected Video and RF TagFrom RF Sub-System20-Bit False
TargetRange W ord(s)
Dow n RangeFalse Target
Strobes
DRFM
JTAG PortPRI Predictor
FT Gen
Techniques Generator
DIO
Up RangeFalse
TargetStrobes
PW Meas.RBM
Generator
19-Feb-2002 14Visit us at http://www.mc-cm.com
Performance 1Performance Comparison
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 10 20 30 40 50 60 70 80 90 100
No. of PRIs per Burst (5 Element/25 Position Stagger Pattern)
Pe
rc
en
t C
orre
ct
Pre
dic
tio
ns
Adaptive
Non-Adaptive
19-Feb-2002 15Visit us at http://www.mc-cm.com
Performance 2
1
10
100
1000
1 10 100 1000 10000
Minimum PRI (us)
Sta
gg
er
Pat
tern
Len
gth
Known Radar ParametersSpecificationMeasured 15/8/01
19-Feb-2002 16Visit us at http://www.mc-cm.com
Summary• PRI prediction is necessary to effectively use a
DRFM-based system in a modern EW training application– Prediction circuitry is not standard
• MC Countermeasures has developed a line of predictors that can be easily interfaced to existing training systems– Integrated with existing TG
– Provide additional TG capability
– Work around insufficient antenna isolation
19-Feb-2002 17Visit us at http://www.mc-cm.com
Acknowledgements• The authors would like to acknowledge the
contributions of Dan Grise and Remi Gauvin who did much of the hardware and software implementation.
• For Further information please feel free to contact us at: MC Countermeasures Inc.
39 Robertson Road – Suite 256Nepean, Ontario, K2H 8R2, CanadaTel: +1(613) 721-1552 Fax: +1 (613) 721-1553
e-mail: [email protected]